I'm a new member to the forum although I admit I previously researched the Yamaha mid section corrosion issue here before purchasing a used boat a few years ago. My current problem relates to a 40 hp 1999 two stroke. It wouldn't start and having had dirty carburetors before, suspected that was the problem again. We removed the carburetors, cleaned and reinstalled them, cleaned the fuel filter, drained the fuel tank, added fresh gas + two stroke oil and replaced the hose from the tank to the engine. The engine started without much effort post rebuild, high idled for a few minutes and then settled down to normal idle. We let the engine run till warm then shut it down and re-started. At restart despite already being warm it went to high idle again. Now every time it's started, it goes to high idle for what seems to be a random amount of time before settling down to normal idle. Have not done the link and sync procedure yet (read about it here), but will do so. As noted above we have previously successfully cleaned the carbs with no issues. I would appreciate any thoughts on what could be causing the high idle problem!